Pro mountain biker, Logan Binggeli has his own test track that he trains on, and improves his settings on continuously. Not only does Logan train and test on this trail, but he has also maintained it for over a decade now.
I've ridden parts of this! Almost got destroyed on the stepup. You can't see it but the landing is a flat rock with a super sharp edge. Case it and your wheel goes bye bye. Glad I didn't die.